Treatment construction method for continuous collapse and roof fall in small-section steep slope tunnel

The invention discloses a treatment construction method for continuous collapse and roof fall in a small-section steep slope tunnel. The treatment construction method comprises the following steps that A, a plurality of rows of supporting arch frames are arranged; B, loose dangerous rocks after blasting load disturbance are blocked through a single beam structure supporting system and an integralarch structure supporting system formed by arranging barrier layers, supporting layers and protection layer pipe sheds, the downward sliding impact force is weakened, and a plurality of layers of buffer protection layers are formed; C, the limitation on a limited space of the small-section steep slope tunnel is overcome through a self-feeding drill pipe capable of being lengthened through assemblyand a conical drill bit with a spiral rotary steel ring, and the rotary drilling force and the rock crushing and breaking effect of the drill pipe are improved; and D, isolation waterproof layers arearranged at the tops of th